China accounts for about 90 per cent of North Korea39;s trade. On Wednesday, Trump took to Twitter to chastise China for allowing its trade with the North to grow in recent months even as the US urged a reduction.But secondary sanctions would still force such companies to stop doing business with North Korea or risk losing their access to the US financial system, and with it, the dollar - the world39;s main currency for global trade and finance.The renewed look at "secondary sanctions" comes as Washington seeks a forceful response to North Korea39;s test this week of an intercontinental China PVC free foam board screw barrel Manufacturers ballistic missile that could strike the United States.Beijing steadfastly opposes such measures.

Some may have no business with Americans or US firms, making it harder for the US to limit their operations or freeze assets.The live-fire drills off South Korea39;s east coast were previously scheduled. "I don39;t like to talk about what I have planned, but I have some pretty severe things that we39;re thinking about," President Donald Trump said on Thursday during an appearance at a news conference in Poland.Secondary sanctions on North Korea would borrow from President Barack Obama39;s Iran approach before the 2015 nuclear deal with Tehran.In a show of force, South Korea and the United States also staged "deep strike" precision missile firing drills on Wednesday as a warning to the North. Few are advocating a military intervention that could endanger millions of lives in allied South Korea across the border. It says sanctions would hurt China39;s interests and criticizes the approach for being one-sided, as opposed to international penalties that are globally agreed.But options for turning the screw on the North financially also are imperfect.Nikki Haley, Trump39;s UN ambassador, told an emergency session of the council on Wednesday that the world must do more to "cut off the major sources of hard currency to the North Korean regime.

Senior US officials said imposing sanctions on companies dealing with the North was among several steps considered after the ICBM launch, as US intelligence, military and diplomatic officials reviewed different possibilities.end-ofTags: north korea nuclear programme, donald trump, un security council, sanctionsLocation: United States, District of Columbia, Washington.The Trump administration hasn39;t given up hope China will change course and step up pressure on North Korea, officials said. Kwon Jeong Seob, who directed the drills, according to the statement.But the US thus far has avoided what sanctions experts describe as a logical escalation: secondary sanctions targeting banks and companies that do any business with North Korea - even legitimate transactions that aren39;t explicitly prohibited by UN Security Council resolutions.